If you don't like Motörhead, there is something wrong with your genetic make up. Gritty, sloppy, tough, raw, heavy, and god damn entertaining, brilliant in their simplicity and absolutely unbeatable in their legacy.
BUY: No Sleep Till Hammersmith. This is the definitive Motörhead, capturing them in the live setting where they're most impressive, pounding out eleven classic tunes mixed with Lemmy's beer-soaked, half-intelligible stage ramblings. Music to do 105 on the freeway to, music to go for that tenth shot of Jack or twelfth beer to, music for getting some hot drunken metal chick on her back in the backseat of your van and not pretending to care what her name is.
Jesus fuck, I just realized all over again how awesome this band is. Also check out the three IOTS mentioned, as well as some surprising musical diversity from Overnight Sensation and the new one, Inferno. Iron Fist is good too.